Heavy metal pollution and health risk assessment of agricultural land in the Southern Margin of Tarim Basin in Xinjiang, China

ABSTRACT

The study aimed to analyze the level of heavy metal pollution in the agricultural lands in the southern margin of Tarim Basin, Xinjiang, and its risks to human health. A total of 1765 soil samples were collected from the Cele-Ruoqiang area. The contents of soil As, Cd, Cr, Cu, Hg, Ni, Pb and Zn were analyzed using the pollution load index method. The results showed that soil was slightly contaminated with Hg and Cd; the multivariate statistical analysis indicated that Cr, Ni, As, Cu, Zn, and Cd were formed mostly by geochemical genesis, whereas Hg and Pb contents by the geological origin and human activities. The health risk assessment showed that there is no unacceptable non-carcinogenic health risk. As levels posed carcinogenic risk, however, they were within human tolerance. Thus, this study provides a scientific basis for local agricultural production safety and prevention and control of soil heavy metal pollution.

KEYWORDS:

• Agricultural land
• soil heavy metals
• health risk assessment
• the southern margin of Tarim Basin of Xinjiang

Additional information

Funding

The study was funded by the Central Repatriation Fund Project of China Geological Survey ‘1:250000 Land Quality Geochemical Survey in Hetian-Ruoqiang Oasis Belt of Xinjiang (S15-1-LQ)’ and the Xinjiang Uygur Autonomous Region Research Innovation Project for Postgraduates ‘Mechanism and Processing Technology of High F⁻ and As Groundwater in the Southern Tarim Basin-a Case Study in Hotan-Ruoqiang Oasis Zone, Xinjiang’.